DestroyWindow does not close window on Mac using Python and OpenCV
My program generates a series of windows using the following code:
python
Pivot String column on Pyspark Dataframe
I have a simple dataframe like this:
Check if a given key already exists in a dictionary and increment it
How do I find out if a key in a dictionary has already been set to a non-None value?
How do I change the string representation of a Python class?
In Java, I can override the toString() method of my class. Then Java’s print function prints the string representation of the object defined by its toString(). Is there a Python equivalent to Java’s toString()? For example, I have a PlayCard class. I have an instance c of PlayCard. Now: >>> print(c) <__main__.Card object at 0x01FD5D30> … Read more
Convert RGB color to English color name, like ‘green’ with Python
I want to convert a color tuple to a color name, like ‘yellow’ or ‘blue’
Querying with function on Flask-SQLAlchemy model gives BaseQuery object is not callable error
I want to query services between two dates and sum their prices. When I try to use func.sum with Services.query, I get TypeError: BaseQuery object is not callable. How do I query using a function with Flask-SQLAlchemy?
Convert a python dict to a string and back
I am writing a program that stores data in a dictionary object, but this data needs to be saved at some point during the program execution and loaded back into the dictionary object when the program is run again.
How would I convert a dictionary object into a string that can be written to a file and loaded back into a dictionary object? This will hopefully support dictionaries containing dictionaries.
Exponentials in python: x**y vs math.pow(x, y)
Which one is more efficient using math.pow or the ** operator? When should I use one over the other?
How do you set a default value for a WTForms SelectField?
When attempting to set the default value of a SelectField with WTForms, I pass in value to the ‘default’ parameter like so.
What do all the distributions available in scipy.stats look like?
Visualizing scipy.stats distributions A histogram can be made of the scipy.stats normal random variable to see what the distribution looks like. % matplotlib inline import pandas as pd import scipy.stats as stats d = stats.norm() rv = d.rvs(100000) pd.Series(rv).hist(bins=32, normed=True) What do the other distributions look like? Answers: Thank you for visiting the Q&A section … Read more